Button for redirect unmodified emails

Hi all,

my name is Stefan.
We've got Horde and wanted to migrate to Zimbra.
Some people make intense use of a funcionality that I'm missing within Zimbra so far. We've got some moderated email lists and want to redirect emails "unmodified" so that it looks like it came from the sender.
So my question now: is there any funcionality like this within Zimbra? Or maybe a workaround?